728440747 has 2 divisors, whose sum is σ = 728440748. Its totient is φ = 728440746.

The previous prime is 728440721. The next prime is 728440771. The reversal of 728440747 is 747044827.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (747044827) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 728440747 - 2¹¹ = 728438699 is a prime.

It is not a weakly prime, because it can be changed into another prime (728440777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364220373 + 364220374.

It is an arithmetic number, because the mean of its divisors is an integer number (364220374).

Almost surely, 2^728440747 is an apocalyptic number.

728440747 is a deficient number, since it is larger than the sum of its proper divisors (1).

728440747 is an equidigital number, since it uses as much as digits as its factorization.

728440747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 351232, while the sum is 43.

The square root of 728440747 is about 26989.6414759441. The cubic root of 728440747 is about 899.7697958554.

The spelling of 728440747 in words is "seven hundred twenty-eight million, four hundred forty thousand, seven hundred forty-seven".